Yes, the older versions still work, they just didn't add Kaillera Servers support on the newest one because it seems Kaillera has a new owner who is planning to patent the name and then release a copyrighted version, making any unofficial kaillera related development ilegal
(this includes adding Kaillera Support for future P2P releases).
but the olders versions are better anyway
. you'll do fine is you get the ones released on Sep 13th, Sep 15th or Nov 1th.
I play people from Europe and South America using Sep 13th or even older, because even though the delay is at 7-9 frames the games run fine.
Sep 15th is apparently the best one, but it lags alot for me when i try to play on kaillera servers, if it runs fine with you then you should stay with this one.
Nov 1th was the lastest release with kaillera support and other cool features, but it will lag if you try to play people who are way too far from you, it works fine for servers.